Alternatively, click on the settings icon in your Linchpin header, then click on Theme > Footer.
What can I customize in the footer configuration?
You can not only customize the backgroud color, the color of the headlines and the color of the links, but also add up more columns to the already existing ones (Online Help, Intranet Tools and Administration).
How do I customize the color of the background, headlines and links? Learn how to do that here. How do I customize the columns in my footer? Learn how to do thathere.